Tanzania's President John Magufuli has died aged 61, the country's vice-president has announced.

He died on Wednesday from heart complications at a hospital in Dar es Salaam, Samia Suluhu Hassan said in an address on state television.

Magufuli had not been seen in public for more than two weeks, and rumours have been circulating about his health.

Opposition politicians said last week that he had contracted Covid-19, but this has not been confirmed.

Magufuli was one of Africa's most prominent coronavirus sceptics, and called for prayers and herbal-infused steam therapy to counter the virus.

During the late night address Vice President Hassan said there would be 14 days of national mourning and flags would fly at half-mast.